Definitions for: Z

[n] the 26th letter of the Roman alphabet; "the British call Z zed but Americans call it zee"
[n] the ending of a series or sequence; "the Alpha and the Omega, the first and the last, the beginning and the end"--Revelation

Webster (1913) Definition: Z (z[=e]; in England commonly, and in America sometimes,
z[e^]d; formerly, also, [i^]z"z[e^]rd)
Z, the twenty-sixth and last letter of the English alphabet,
is a vocal consonant. It is taken from the Latin letter Z,
which came from the Greek alphabet, this having it from a
Semitic source. The ultimate origin is probably Egyptian.
Etymologically, it is most closely related to s, y, and j; as
in glass, glaze; E. yoke, Gr. ?, L. yugum; E. zealous,
jealous. See Guide to Pronunciation, [sect][sect] 273, 274.